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67@ d M/j UNITED STATES PATENT OEEICE.

JESSE VAN DENBURGH, OF CHICAGO, ILLINOIS.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 310,337, dated January 6, 1885.

Application filed Juue, 1884. (No model.)

To @ZZ whom t may concern.-

Beit known that I, JEssE VAN DENEUEGH,

g a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and usefulA l easily and readily, and allow the bolt or rod to have its thread cut and the cutting-dies to be disengaged therefrom without running them back off the thread so cut.

The invention is designed as an improvement upon the device set forth in Patent No. 251,322, of 1881, in which power was applied to a hollow mandrel through a pulley which ran loose when the cutting-dies were not in operation. A clutch engaged a cam and sleeve with the hub of the pulley, and cam-slots in the sleeve moved pins to cause the die-carriers to open and withdraw the dies from the blank being operated upon. In that patent the die-carriers, when withdrawing the dies from their service, turned on pivots, and had a swinging movement on said pivots as forced y by the cam-slots. This I iindto be objectionable, and the present improvements are designed to provide such a construction that the carriers will be withdrawn in a direct line, the vibration be greatly decreased, and the angle of the camslots be such that the required work may be done with much more case. IVith this explanation it will only be necessary to describe brieiiy the parts ot' the device which bear directly upon the improved construction and arrangement.

The invention is illustrated in the accompanying drawings, which form a part of this specification, and in which Figure 1 is a front end elevation; Fig. 2, a longitudinal side elevation, and Fig. 3 a similar view taken at right angles thereto.

Referring to the drawings, in which similar letters of reference indicate like parts in all the figures, A A designate the die-carriers, which operate in recesses C in the back piece, B, and they are provided each with laterallyprojecting arms D D, which operate loosely in the cam-slots Dl D', as shown, to give said carriers a direct motion when forced in either direction bythe action of the cam-slots D upon the arms D. rlhe slots D are formed in the cam-plates E, which are secured to the sleeve F, which sleeve has a longitudinal movement upon the shaft or mandrel, and may be impelled by any proper means-as,

for instance, by means similar to those mentioned in the patenthereinbefore referred to. The die-carriers A are held in their position in the recesses C by means of the T-shaped pieces H, which pieces are firmly secured to the back pieces, B, by screws I, as shown in Figs. 2 and 3, and the position of the dies is adjusted by means of the screws'G.

The operation of the device will be obvious. The elements ot novelty in this invention accrue, essentially, to the sliding carriers, with means for moving them in a direct line, and their relations with the T-pieces H, cam-plate E, having slots D', the dies, and the adjusting means.

Vhat I claim as new, and desire to secure by Let-ters Patent of the United States, is-

1. In combination with the longitudinallymoving sleeve of a screw-cutting machine, substantially as described, and with the camslots D', the die-carriers A, having arms I), adapted to carry the dies, and to be moved outward or inward in a direct line, as set` forth.

2. The combination of the cam-plates E, having cam-'slots D', with the die- .carriers having arms D, the adjustable dies, as shown, the T- pieces H, and screws I and G, as and. for the purpose set i'orth.

In testimony whereof I a'iix my signature-in presence of two witnesses.

W. J. MURPHY, LoEEN GREENE. 

